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Figure 2-5 Compressor Cooling Path - TTS300/TGS230

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Table 2-3 Compressor Cooling Path - (TTS300/TGS230)

No. Description No. Description

1 FromMotorWindingTempSensor 8 SCRManifold

2 BMCC 9 Motor/RotorCoolingGas

3 SolenoidM 10*MTOnly Coolingpathre-entersatthesuctionlineofthechiller

4 SolenoidE 11*MTOnly PressureRegulatingValve

5 LiquidRefrigerantInlet 12*MTOnly Coolingpathredirectsoutsideofthecompressor

6 Orifice 13 FromMotorCavityTemp.Sensor

7 FromInverterTempSensor 14 Inverter

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2.3 Capacity Control

Capacitycontrolofthecompressorisachievedprimarilybyspeedmodulation.Whenunloading,thecompressor’s

firstactionistoreducespeedtoslightlyabovetheminimum(surge)speedforthepressureratiopresentatthetime.

Furtherreductionincapacityandanincreaseinshaft/impellerstabilitycanbeachievedbyclosingtheIGVs.These

arevariableanglevanesinstalledinthesuctioninletaheadofthefirst-stageimpeller.Theseguidevanesrestrictthe

refrigerantfromenteringtheimpellerinlet,aswellasimpartinga“pre-swirl”oftherefrigerantinthedirectionof

impellerrotationtoincreaseenergyefficiencyduringpartloadoperation.

M-SV-001-EN Rev. H-1/23/2023 Page 37 of 294

Danfoss TTS400 User Manual

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